40 Volume developer is not recommended to use when bleaching hair as it is very strong and can cause major damage if not done by a professional. 20-30 volume would be better and safer for home use.
Yes a 40 developer will lift your hair color 4 times. It will lighten your hair. You will need to mix it with a color and follow the directions on the box or packaging.
Which developer you use will depend on the color you want to achieve. A 20 developer will give you a darker color than a 30 or 40 developer.
30 or 40 depending how bright you want it
It is possible to color your hair then dip dye it afterwards in the same day. However, it is recommended that you use a 10 developer or a 20 developer, as a 30 developer and a 40 developer can cause more damage to your hair. It is also not recommended to bleach your hair more than once every two weeks.
20 Volume (or 6%) developer will lift hair 2 levels and 40 Volume (or 12%) will lift hair 4 levels.
flashlightning 30 vol. or 40 vol.
yes
To lift or make lighter you want to use, 30, and 40 Valium developer. To darker you use 10 and 20 Valium developer. Also to go lighter use a hair dryer. For darker room temperature. Colour should never be left in the hair longer then the time recommended, it over processes and the fades much fast.
Yes. The developer needs to be mixed with a color first, such as a permanent color, or hair lightener. I don't recommend you just adding the developer directly to your hair by itself, although I don't think much will happen since it's hydrogen peroxide or it will lighten your hair slightly. Practice precautions.
Developer is used with professional color to adjust level of color desired. For example, black hair could be described as level 1, adding blonde highlights would require a 40 volume developer to lift the color of your hair 4 shade levels.
It depends on how light you want to lift the current color in your hair. For light colored hair such as light brown to a normal dark brown you can use a 20. But if your hair is a very dark brown that looks almost close to black you would use a 30 or maybe even a 40 if it's really dark. A 20 developer will lift your hair color twice as much and a 30 developer,3 times as much. Lifting means making it lighter. You can watch the color as it processes and once it reaches the desired lightness you rinse to make it stop processing. Most hair dressers start with a 20 volume developer but it still depends on the current color of your hair.
No. Rinse is a temporary color. 40 volume developer is used for high lift color, lifting more than 4 levels. When you apply 40vol to your hair, you are lifting the cuticle layer of the hair, difusing pigment inside the cortex and preparing for lift. This causes a certain amount of damage to the hair. It would not be a good idea to use this for a rinse. I would suggest seeing a professional if you want good results. There is a reason professionals go to school to learn these things :)